The main categories that are prohibited from being used as trademarks are as follows:

1. Signs that are contrary to the principle of public interest: If the use of trademark signs may infringe on public rights, Any trademark that has national interests or hinders the realization of public welfare, such as country name, national flag, national emblem, military flag, military emblem, etc., shall not be used as a trademark.

2. Marks that are easily misleading: If the use of a trademark mark may mislead the public and mislead them about the goods or services, such as using a false, exaggerated, ambiguous or misleading mark , shall not be used as a trademark.

3. Logo that plagiarizes other people’s logos: If the use of a trademark logo is likely to cause confusion, misunderstanding, or plagiarism with other people’s trademarks, it shall not be used as a trademark.

4. Signs that violate socialist moral trends: If the use of a trademark sign violates socialist moral trends and is likely to cause public dissatisfaction, it must not be used as a trademark.

5. Signs that violate legal provisions: If the use of a trademark sign violates the provisions of laws or administrative regulations, such as signs that are likely to cause disgust, divisiveness, illegality or harm the rights and interests of others, it shall not be used as a trademark.

It should be noted that in different countries and regions, the regulations on signs that are prohibited from being used as trademarks may be different.